850666803856 has 45 divisors (see below), whose sum is σ = 1707174757353.
Its totient is φ = 410615083200.
The previous prime is 850666803851. The next prime is 850666803923. The reversal of 850666803856 is 658308666058.
The square root of 850666803856 is 922316.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 446069037456 + 404597766400 = 667884^2 + 636080^2
It is a super-2 number, since 2×8506668038562 (a number of 25 digits) contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 850666803794 and 850666803803.
It is not an unprimeable number, because it can be changed into a prime (850666803851) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 106984681 + ... + 106992631.
Almost surely, 2850666803856 is an apocalyptic number.
850666803856 is the 922316-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 850666803856
850666803856 is an abundant number, since it is smaller than the sum of its proper divisors (856507953497).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
850666803856 is an frugal number, since it uses more digits than its factorization.
850666803856 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15968 (or 7982 counting only the distinct ones).
The product of its (nonzero) digits is 49766400, while the sum is 61.
The spelling of 850666803856 in words is "eight hundred fifty billion, six hundred sixty-six million, eight hundred three thousand, eight hundred fifty-six".